It increases drag the same way it increases downforce. Probably gain a little air to the intercooler while blocking some to the radiator intake under the car. Anyone know of the Solstice having too much lift at the front end or the rear for that matter. Cornering at speeds in excess of 100 mph some downforce would be welcome but would need big spoilers & splitters which will cut into your top speed, mileage & tire wear. Just get a peel & stick fake hood scoop & call it a day.